package demo02override;
/*
* 数学工具类
*   public static double abs(double num);
*   public static double floor(double num);向下取整
*   public static double ceil(double num);向上取整
*   public static long round(double num);四舍五入
*   Math.PI;圆周率，而且是final的
* */
public class Demo03Math {

}
